AI 中文总结
研究扭曲双层 WSe₂ 中能带拓扑在超导关联物理里的作用，基于第一性原理，通过构建紧致分子轨道确定能带拓扑非平凡，提取相关参数为有效哈密顿量提供基准，为理解莫尔 TMDs 超导性奠定基础。
AI 中文摘要
扭曲双层 WSe₂（tWSe₂）中近期超导观测引发了非传统配对机制的理论提议。核心问题是能带拓扑是否在系统关联物理中起关键作用。本文基于第一性原理描述 tWSe₂ 顶部莫尔价带，用密度泛函理论计算确定相关扭曲角范围的能带拓扑非平凡，顶部价带在 K 谷的陈数为 C=(+1,+1)。为处理强关联物理，通过部分万尼尔化过程并在自旋 C₃z 对称表示指导下直接从 DFT 波函数构建紧致分子轨道，得到局域 f 轨道和互补拓扑 c 轨道，提取跳跃和杂化幅度，为有效哈密顿量提供从头算基准。该工作为理解莫尔 TMDs 中的超导性奠定基础，凸显 tWSe₂ 是探索拓扑超导性的有前景平台。
英文摘要
Recent observations of superconductivity in twisted bilayer WSe$_2$ (tWSe$_2$) have motivated theoretical proposals for unconventional pairing mechanisms. A central question is whether band topology plays an essential role in the system's correlation physics. In this letter, we develop a first-principles-based description of the top moiré valence bands in tWSe$_2$. Using density functional theory (DFT) calculations, we identify the bands in the relevant range of twist angles to be topologically non-trivial, with the top valence bands carrying Chern numbers $C=(+1,+1)$ for the $K$ valley. In order to treat the strong correlation physics, we construct compact molecular orbitals directly from the DFT wave functions through a partial Wannierization procedure and with the guidance of spinful $C_{3z}$ symmetry representations. This yields a localized $f$ orbital together with a complementary topological $c$ orbital, allowing us to extract hopping and hybridization amplitudes from first principles. The resulting parameters provide an ab initio benchmark for the effective Hamiltonian. Our work establishes a foundation for understanding superconductivity in moiré TMDs and highlights tWSe$_2$ as a promising platform for exploring topological superconductivity.
Comments6 + 5 pages; 4 + 5 figures
